<template>
    <div class="upload-file">
        <el-upload
            ref="fileUploadRef"
            multiple
            :action="uploadFileUrl"
            :before-upload="handleBeforeUpload"
            :file-list="fileList"
            :limit="limit"
            :accept="fileAccept"
            :on-error="handleUploadError"
            :on-exceed="handleExceed"
            :on-success="handleUploadSuccess"
            :show-file-list="false"
            :headers="headers"
            class="upload-file-uploader"
            v-if="!disabled"
        >
            <!-- 上传按钮 -->
            <el-button type="primary">选取文件</el-button>
        </el-upload>
        <!-- 上传提示 -->
        <div v-if="showTip && !disabled" class="el-upload__tip">
            请上传
            <template v-if="fileSize">
                大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
            </template>
            <template v-if="fileType">
                格式为 <b style="color: #f56c6c">{{ fileType.join('/') }}</b>
            </template>
            的文件
        </div>
        <!-- 文件列表 -->
        <transition-group
            class="upload-file-list el-upload-list el-upload-list--text"
            name="el-fade-in-linear"
            tag="ul"
        >
            <li
                v-for="(file, index) in fileList"
                :key="file.uid"
                class="el-upload-list__item ele-upload-list__item-content"
            >
                <el-link :href="`${file.url}`" :underline="false" target="_blank">
                    <span class="el-icon-document"> {{ getFileName(file.name) }} </span>
                </el-link>
                <div class="ele-upload-list__item-content-action">
                    <el-button type="danger" v-if="!disabled" link @click="handleDelete(index)">删除</el-button>
                </div>
            </li>
        </transition-group>
    </div>
</template>

<script setup lang="ts">
import { systemOssService } from '@great/services';
import { globalHeaders, propTypes } from '@/utils/ruoyi';
import type { ElUploadInstance, UploadFile } from '@/pages/system/system.d';
const props = defineProps({
    modelValue: {
        type: [String, Object, Array],
        default: () => []
    },
    // 数量限制
    limit: propTypes.number.def(5),
    // 大小限制(MB)
    fileSize: propTypes.number.def(5),
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: propTypes.array.def(['doc', 'docx', 'xls', 'xlsx', 'ppt', 'pptx', 'txt', 'pdf']),
    // 是否显示提示
    isShowTip: propTypes.bool.def(true),
    // 禁用组件（仅查看文件）
    disabled: propTypes.bool.def(false)
});

const { proxy } = getCurrentInstance() as any;
const emit = defineEmits(['update:modelValue']);
const number = ref(0);
const uploadList = ref<any[]>([]);

// const baseUrl = import.meta.env.VITE_APP_BASE_API;
const baseUrl = `${RUOYI_SERVICE_BASE_URL}`;
const uploadFileUrl = ref(baseUrl + '/system/oss/upload'); // 上传文件服务器地址
const headers = ref(globalHeaders());

const fileList = ref<any[]>([]);
const showTip = computed(() => props.isShowTip && (props.fileType || props.fileSize));

const fileUploadRef = ref<ElUploadInstance>();

// 监听 fileType 变化，更新 fileAccept
const fileAccept = computed(() => props.fileType.map(type => `.${type}`).join(','));

watch(
    () => props.modelValue,
    async (val: any) => {
        if (val) {
            let temp = 1;
            // 首先将值转为数组
            let list: any[] = [];
            if (Array.isArray(val)) {
                list = val;
            } else {
                const res = await systemOssService.listByIds(val);
                list = res.data.map(oss => {
                    return {
                        name: oss.originalName,
                        url: oss.url,
                        ossId: oss.ossId
                    };
                });
            }
            // 然后将数组转为对象数组
            fileList.value = list.map(item => {
                item = { name: item.name, url: item.url, ossId: item.ossId };
                item.uid = item.uid || new Date().getTime() + temp++;
                return item;
            });
        } else {
            fileList.value = [];
            return [];
        }
    },
    { deep: true, immediate: true }
);

// 上传前校检格式和大小
const handleBeforeUpload = (file: any) => {
    // 校检文件类型
    if (props.fileType.length) {
        const fileName = file.name.split('.');
        const fileExt = fileName[fileName.length - 1];
        const isTypeOk = props.fileType.indexOf(fileExt) >= 0;
        if (!isTypeOk) {
            proxy?.$modal.msgError(`文件格式不正确, 请上传${props.fileType.join('/')}格式文件!`);
            return false;
        }
    }
    // 校检文件名是否包含特殊字符
    if (file.name.includes(',')) {
        proxy?.$modal.msgError('文件名不正确，不能包含英文逗号!');
        return false;
    }
    // 校检文件大小
    if (props.fileSize) {
        const isLt = file.size / 1024 / 1024 < props.fileSize;
        if (!isLt) {
            proxy?.$modal.msgError(`上传文件大小不能超过 ${props.fileSize} MB!`);
            return false;
        }
    }
    proxy?.$modal.loading('正在上传文件，请稍候...');
    number.value++;
    return true;
};

// 文件个数超出
const handleExceed = () => {
    proxy?.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
};

// 上传失败
const handleUploadError = () => {
    proxy?.$modal.msgError('上传文件失败');
};

// 上传成功回调
const handleUploadSuccess = (res: any, file: UploadFile) => {
    if (res.code === 200) {
        uploadList.value.push({
            name: res.data.fileName,
            url: res.data.url,
            ossId: res.data.ossId
        });
        uploadedSuccessfully();
    } else {
        number.value--;
        proxy?.$modal.closeLoading();
        proxy?.$modal.msgError(res.msg);
        fileUploadRef.value?.handleRemove(file);
        uploadedSuccessfully();
    }
};

// 删除文件
const handleDelete = (index: number) => {
    let ossId = fileList.value[index].ossId;
    systemOssService.delOss(ossId);
    fileList.value.splice(index, 1);
    emit('update:modelValue', listToString(fileList.value));
};

// 上传结束处理
const uploadedSuccessfully = () => {
    if (number.value > 0 && uploadList.value.length === number.value) {
        fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value);
        uploadList.value = [];
        number.value = 0;
        emit('update:modelValue', listToString(fileList.value));
        proxy?.$modal.closeLoading();
    }
};

// 获取文件名称
const getFileName = (name: string) => {
    // 如果是url那么取最后的名字 如果不是直接返回
    if (name.lastIndexOf('/') > -1) {
        return name.slice(name.lastIndexOf('/') + 1);
    } else {
        return name;
    }
};

// 对象转成指定字符串分隔
const listToString = (list: any[], separator?: string) => {
    let strs = '';
    separator = separator || ',';
    list.forEach(item => {
        if (item.ossId) {
            strs += item.ossId + separator;
        }
    });
    return strs != '' ? strs.substring(0, strs.length - 1) : '';
};
</script>

<style lang="scss" scoped>
.upload-file-uploader {
    margin-bottom: 5px;
}

.upload-file-list .el-upload-list__item {
    border: 1px solid #e4e7ed;
    line-height: 2;
    margin-bottom: 10px;
    position: relative;
}

.upload-file-list .ele-upload-list__item-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: inherit;
}

.ele-upload-list__item-content-action .el-link {
    margin-right: 10px;
}
</style>
